Remove periods for consistency

Author: marcphilipp

.github/ISSUE_TEMPLATE/config.yml

@@ -2,7 +2,7 @@ blank_issues_enabled: false
 contact_links:
   - name: Ask a question
     url: https://github.com/junit-team/junit5/discussions/categories/q-a
-    about: Please ask and answer questions here.
+    about: Please ask and answer questions here
   - name: Ask a question (Stack Overflow)
     url: https://stackoverflow.com/questions/tagged/junit5
-    about: Alternatively, ask questions here.
+    about: Alternatively, ask questions here